625986997 has 2 divisors, whose sum is σ = 625986998. Its totient is φ = 625986996.

The previous prime is 625986967. The next prime is 625987001. The reversal of 625986997 is 799689526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599711121 + 26275876 = 24489^2 + 5126^2 .

It is a cyclic number.

It is not a de Polignac number, because 625986997 - 2¹¹ = 625984949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625986967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312993498 + 312993499.

It is an arithmetic number, because the mean of its divisors is an integer number (312993499).

Almost surely, 2^625986997 is an apocalyptic number.

It is an amenable number.

625986997 is a deficient number, since it is larger than the sum of its proper divisors (1).

625986997 is an equidigital number, since it uses as much as digits as its factorization.

625986997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 61.

The square root of 625986997 is about 25019.7321528429. The cubic root of 625986997 is about 855.4378009340.

The spelling of 625986997 in words is "six hundred twenty-five million, nine hundred eighty-six thousand, nine hundred ninety-seven".